If you were Luis, the correct response to the question "¿Quién es usted?" would be:
- A. Yo soy Luis.
Explanation: In Spanish, "Yo soy Luis" translates to "I am Luis," which is the appropriate way for Luis to respond to the question asking for his identity. This option directly states his name and clarifies who he is in a simple and clear manner. It's a common and correct way to introduce oneself in Spanish when asked for your name.